The event is sold out but fans can always get tickets if they are willing to pay the price.

The final phase of set up for Lollapalooza as Grant Park is transformed for the three-day music festival.

"Can you believe we sold out in two hours? That is nuts," said founder Perry Farrell.

Jane's Addiction front man and founder of Lollapalooza arrived in Chicago to talk with reporters about the festival that opens Friday.

One hundred thousand people are expected in the park each day as in years past.

Tickets are now being sold by brokers and individuals.

The Better Business Bureau offered some tips to avoid receiving a counterfeit ticket.

Check to make sure the broker is licensed as required in the state of Illinois.

Do not ever wire funds for payment. Be careful buying tickets on Craig's Lists.

Deal only with brokers that provide clear details concerning the terms of the transaction. For instance, you should know up-front the amount of the surcharge for each purchase; whether the tickets are guaranteed; how they will be sent to you and the timeframe for delivery; and the broker's refund, rescheduling and cancellation policies.

Check if the ticket broker is a member of the National Association of Ticket Brokers (NATB) and the Better Business Bureau.

Visit several Web sites to compare prices and ticket availability for the event you're interested in attending.

Do not buy tickets from Internet sites that are not secure or lack a privacy policy; fail to disclose their refund, rescheduling and cancellation policies; do not provide a telephone number and fixed place of business; or insist on cash payment.

Pay with a credit card or another secure form of payment so you can dispute the charge with your credit card issuer or bank.

If the ticket price is low, take that as a red flag.

Buying from scalpers at the event is not a good idea.

If the tickets that you purchase are priced over face value, be wary. It is illegal for scalpers to charge over face value.

For those with tickets, public transportation is encouraged. And for those driving downtown, know the closures and crowds will be in effect.

"We always push for public transportation. Stay west of the Michigan Avenue, that's probably the best advice I can give, to avoid as much of the traffic as you can," said Gary Schenkel, Chicago Office of Emergency Management.